AFNetworking detect when wifi connection without active internet connection

Question

I'm using AFNetworking and was wondering how to detect a scenario when user is connected to a wifi network without active internet connection.

I reproduce this scenario buy powering a router without connecting the dsl line.

AFNetworking return  AFNetworkReachabilityStatusReachableViaWiFi = 2

my code:

 [[AFNetworkReachabilityManager sharedManager] setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
        NSLog(@"Reachability: %@", AFStringFromNetworkReachabilityStatus(status));
        self.isInternetAvialable = status > 0;
    }];

thanks

I refacotred the code to be like

  AFNetworkReachabilityManager* manager = [AFNetworkReachabilityManager managerForDomain:@"http://www.google.com"];
        [manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
            NSLog(@"Reachability: %@", AFStringFromNetworkReachabilityStatus(status));
            self.isInternetAvialable = status > 0;
        }];
        [manager startMonitoring];

now the block never get called!

Answer 1

Rather than using [AFNetworkReachabilityManager sharedManager] which just monitors network connectivity, you can use [AFNetworkReachabilityManager managerForDomain:(NSString *)domain] and pass an appropriate hostname - such as "www.google.com" - this way you can test whether the network you are connected to has Internet access - it can still be fooled by local DNS and a web server, but I would think that it is unlikely someone would do that.

Once you have your AFNetworkReachabilityManager you can set the change block as you do for the shared manager

Answer 2

Use Reachability class and its reachabilityForInternetConnection method.

Reachability *networkReachability = [Reachability reachabilityForInternetConnection];   
NetworkStatus networkStatus = [networkReachability currentReachabilityStatus];    

if (networkStatus == NotReachable) 
{        
    NSLog(@"There is NO Internet connection");        
} 
else 
{        
     NSLog(@"There is Internet connection");        
}

Answer 3

Go through Reachability class by Apple. It has all the functions you need. Your best bet here is to use a domain (like Google) to check for actual internet connectivity.

Summarised sample code:

Add observer in didFinishLaunchingWithOptions:

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(checkNetworkStatus:)
                                             name:kReachabilityChangedNotification
                                           object:nil];

internetReachable = [[Reachability reachabilityForInternetConnection] retain];

[internetReachable startNotifier];

// check if a pathway to a random host exists

hostReachable = [Reachability reachabilityWithHostname:@"SOME_HOST"];

[hostReachable startNotifier];

Then, in the target method:

- (void) checkNetworkStatus:(NSNotification *)notice {

NetworkStatus internetStatus = [internetReachable currentReachabilityStatus];

switch (internetStatus)
{
    case NotReachable:
    {
        NSLog(@"The internet is down.");

        break;
    }
    case ReachableViaWiFi:
    {
        NSLog(@"The internet is working via WIFI.");

        break;
    }
    case ReachableViaWWAN:
    {
        NSLog(@"The internet is working via WWAN.");

        break;
    }
}

NetworkStatus hostStatus = [hostReachable currentReachabilityStatus];

switch (hostStatus)
{
    case NotReachable:
    {
        NSLog(@"A gateway to the host server is down.");

        break;
    }
    case ReachableViaWiFi:
    {
        NSLog(@"A gateway to the host server is working via WIFI.");

        break;
    }
    case ReachableViaWWAN:
    {
        NSLog(@"A gateway to the host server is working via WWAN.");

        break;
    }
}
}